Center letter: o
Outer letter: c g h i n u
Answers (40):
  couching
  coughing
  hiccoughing
  chignon
  chino
  cocci
  cocoon
  cocooning
  coho
  coin
  coining
  conch
  conic
  conning
  cooing
  couch
  cough
  gnocchi
  going
  gong
  gonging
  goon
  gouging
  hiccough
  hogging
  honcho
  honing
  hooch
  icon
  iconic
  ionic
  noggin
  nonunion
  noon
  noun
  nuncio
  ongoing
  onion
  ouch
  union